NZ793433B2 - Drive element - Google Patents

Abstract

The present invention relates to a drive element (8) which has an internal driving profile (9) that defines a profile axis (PI) and has, on an inner side, a plurality of concave drive faces (6) arranged in a manner distributed regularly around the profile axis (PI), between which planar or convexly curved transitional faces (7a) are provided, or which has an external driving profile (9) that defines a profile axis (PA) and has, on an outer side, a plurality of concave drive faces (10) arranged in a manner distributed regularly around the profile axis (PA), between which planar or convexly curved transitional faces (7a) are provided. In cross-section, transition points (P1) or transitions between each drive surface (6, 10) and each transition surface (7, 7a) lie on a common inner circle having an inner diameter Di, and the drive surfaces (6) lie on outer circles each having an outer diameter Da, the outer circles being distributed uniformly around each profile axis (PI, PA) and being formed symmetrically with respect to their longitudinal central plane enclosing each profile axis (PI , PA ). The outer diameter Da and a center-to-center distance L between the centers of the outer circles and the centre of the inner circle are selected as a function of the inner diameter Di wherein a running ratio K=Da /Di is in a range of 0.3 and 2.0 and the center-to-center distance L is calculated according to a formula L=F(L, Di) Di , where F(L, Di ) = 0.494e^(0.605K).

Claims (24)

Claims

1.

2. A drive element (8) 5 which has an inner driving profile (5) which defines a profile axis (PI) and has on an inner side a plurality of concave, i.e. curved inwardly s the profile axis (PI), drive es (6) ed uniformly distributed around the profile axis (PI) n which planar or convexly curved transition surfaces (7) are provided, or which has an outer driving profile (9) which defines a profile axis (PA) and has on an e a plurality of concave, i.e. curved ly towards the profile axis (PI), drive surfaces (10) arranged distributed uniformly about the profile axis (PA) between which planar 15 or convexly curved transition surfaces (7a) are provided, wherein in cross-section, transition points (P1) or transitions between each drive surface (6, 10) and each transition surface (7, 7a) lie on a common inner circle having an inner diameter Di, and the drive surfaces (6) lie on outer circles each having an outer diameter Da, the outer circles being distributed uniformly around each profile axis (PI, PA) and being formed symmetrically with respect to their longitudinal central plane enclosing each 25 profile axis (PI , PA ), wherein the outer diameter Da and a center-to-center distance L between the centers of the outer circles and the centre of the inner circle are selected as a on of the inner diameter Di of 30 the inner circle such that the normal force acting at the transition points between in each case one drive surface (6, 10) and the adjacent transition surface (7, 7a) when a torque MD about the profile axis (PI , PA ) is introduced into the drive profile (5, 9), is tangential to the drive surface (6, 10) adjacent to 35 the one drive surface (6, 10) or is directed into the central region of the driving e (5, 9), the central region being is positioned between the drive surface (6, 10) and the profile axis (PI , PA ), n 40 a running ratio K=Da /Di is in a range of 0.3 and 2.0, wherein the center-to-center ce L is calculated according to a formula L=F(L, Di) Di , where F(L, Di ) = 0.494 e (0,605K). 5 2. The drive element according to claim 1, wherein the drive element comprises an inner driving e (5) and the drive surfaces (6) of the inner driving profile (5) are inclined with respect to the profile axis (Pa ), approaching the profile axis (Pa) starting from an insertion opening (5a) of the inner driving profile (5) towards a rear 10 end of the inner driving profile (5).

3. The drive element according to claim 2, wherein the drive surfaces (6) of the inner driving profile (5) are ed relative to the e axis (Pa) by an angle of inclination aI which is at least 15 1°, in particular at least 1,5° and/or in that the drive surfaces (6) of the inner driving profile (5) are inclined relative to the profile axis (PI) by an angle of inclination aI of at most 5°, in particular at most 3.5° and preferably at most 3°, the angle of inclination aI preferably being 2° ± 0.2°, or 3° ± 0.2°.

4. The drive element according to claim 3, wherein the tion surfaces (7) are inclined with respect to the profile axis (PI) and approach the profile axis (PI ) starting from the insertion opening (5a) of the inner driving profile (5) towards the rear end of the 25 inner driving profile (5).

5. The drive element according to claim 4, wherein the transition surfaces (7) are inclined ve to the profile axis (PI ) by an angle of inclination ßI which is at least 1°, in particular at least 30 1,5° and/or in that the transition es (7) of the inner driving profile (5) are inclined relative to the profile axis (PI ) by an angle of inclination ßI of at most 5°, in particular at most 3.5° and preferably at most 3°, the angle of inclination ßI ably being 2° ± 0.2°, or 3° ± 0.2°.

6. The drive element according to claim 5, wherein an angle of inclination aI of the drive surfaces (6) relative to the e axis (PI ) is as large as an angle of inclination ßI of the transition surfaces (7) relative to the profile axis (PI ).

7. The drive element according to one of the preceding claims, wherein the drive element has an outer driving profile (9) and the drive surfaces (10) of the outer driving profile (9) are inclined with t to the profile axis (PA ), approaching the profile axis (PA ) 5 towards an insertion end of the outer driving profile (9).

8. The drive element according to claim 7, wherein the drive surfaces (10) are inclined with respect to the profile axis (PA ) by an angle of inclination aA , which is at least 0.5°, in particular at 10 least 1° and/or is at most 1.5°, the angle of inclination aA preferably being 1.15° ± 0.2°.

9. The drive element according to claim 8, wherein the transition surfaces (7a) are ed with respect to the profile axis (PA) at 15 an angle of inclination ßA which is greater than 0° and less than 0.7° and is ably 0.4° ± 0.05°.

10. The drive element according to claim 9, wherein the angle of inclination ßA of the transition surfaces (7a) relative to the profile 20 axis (PA) is smaller than an angle of inclination aA of the drive surfaces (10) relative to the profile axis (PA ), and a ratio of the angle of inclination aA to the angle of inclination ßA being = 2, in particular = 2.5, and preferably being 2.8 ± 0.2. 25

11. The drive element according to one of the previous claims, wherein the outer er (DA ) of each outer circle is constant over an axial length of the driving profile (5, 9).

12. The drive element according to one of the previous claims, 30 wherein the inner diameter (DI ) over an axial length of the driving profile (5, 9) is constant or increases uously in adaptation to an inclination of the transition surfaces (7, 7a) with respect to the respective profile axis (PI , PA ) in the case of an inner driving profile (5) in the direction of its insertion opening (5a) and in the 35 case of an outer driving profile (9) starting from an ion end.

13. The drive element according to any one of the preceding claims, n the g e (5, 9) has five or six drive surfaces (6,

14. The drive element according to one of the previous claims, n the drive element (1) is a screw and the inner driving profile (5) is formed on a screw head (4) of the screw. 5

15. The drive element according to any one of claims 1 to 14, wherein the drive element (8) is a screw bit.

16. A method for connecting a screw (1) and a rotary tool (8), in a rotationally fixed manner, one of the components being designed as a 10 drive t (8) with an outer driving profile (5, 9) and the other ent being configured as a drive element (1) with an inner driving profile (5), in which the driving profiles (5, 9) of the screw and rotary tool (1, 8) are plugged together axially in order to produce a onally fixed connection between the screw and rotary tool (1, 15 8), wherein the screw and rotary tool are designed as drive elements (1, 8) according to one of the previous claims and the driving profiles (5, 9) of the drive elements (1, 8) are selected to be mentary to one another in such a way that the drive surfaces (6, 10) of the screw and rotary tool (1, 8) come into contact with one another in a 20 2-dimensional manner when the driving profiles (5, 9) are axially plugged together, so that a frictional and/or clamping tion, via which the screw and rotary tool (1, 8) are y connected to one another, is produced between the screw and rotary tool (1, 8). 25

17. The method according to claim 16, wherein the driving profiles (5, 9) of the screw and rotary tool (1, 8) have drive surfaces (6, 10) inclined to their respective profile axis (PI, PA).

18. The method according to claim 17, n an angle of inclina- 30 tion ai, by which the drive surfaces (6) of the inner driving profile (5) are inclined with respect to the profile axis (PI), is r than an angle of inclination aA , by which the drive surfaces (6) of the outer driving profile (10) are inclined with respect to the profile axis (PA ).

19. The method according to claim 18, wherein the angle of inclination aI of the drive surfaces (6) of the inner driving profile (5) is 3° ± 0.2° and the angle of inclination aA of the drive surfaces (10) of the outer g profile (6) with respect to the profile axis 40 (PB) is 1,15° ± 0.15°, or that the angle of inclination ai of the drive surfaces (6) of the inner driving profile (5) relative to the e axis (PI) is 2° ± 0.2° and the angle of inclination aA of the drive surfaces (10) of the outer driving profile (6) ve to the profile axis (PA) is 1.15° ± 0.15°.

20. The method according to one of claims 16 to 19, wherein transition surfaces (7, 7a) of the driving profiles (5, 9) of the screw and rotary tool (1, 8) are inclined with t to the respective profile axis (PI, PA), wherein an angle of inclination ßi of the transition 10 surfaces (7) of the inner driving profile (5) relative to the profile axis (PI ) to an angle of inclination (ßA) by which the transition surfaces (7a) of the outer driving profile (9) are inclined relative to the profile axis (PI) is = 5, in particular = 6 and ably =

21. The method according to one of claims 16 to 20, wherein drive elements (1, 8) are used in which an outer diameter (Da) of the inner driving profile (5) is smaller, in particular by 1.5 - 3% and preferably by 2% smaller, than an outer diameter (Da) of the outer driving 20 profile (6).

22. The method according to one of claims 16 to 21, wherein the drive surfaces (6, 10) of the screw and rotary tool come into surface contact with one another over at least 25%, in particular at least 25 40% and ably at least 60% of their extent in the circumferential direction.

23. The method ing to one of claims 16 to 22, wherein the screw and rotary tool come into contact with each drive surface (6, 30 10) on both sides of the longitudinal center plane thereof.

24. The method according to one of claims 16 to 23, wherein the driving profiles (5, 9) are configured in such a way that they do not come into contact in a region of the transition surfaces (7, 7a). W0 09624